example: Pre-install firewalld package

This prepares the later secure-by-default configuration of the image.

Signed-off-by: Baocheng Su <baocheng.su@siemens.com>

Author: BaochengSu

meta-example/recipes-core/images/iot2050-package-selections.inc

@@ -61,6 +61,7 @@ IOT2050_DEBIAN_DEBUG_PACKAGES = " \
     dmidecode \
     mokutil \
     util-linux-extra \
+    firewalld \
     "
 
 # wifi support